// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_LOCKED_QUEUE_
#define V8_LOCKED_QUEUE_

//#include "src/allocation.h"
//#include "src/base/platform/platform.h"
#include "mutex.h"

namespace v8 {
namespace internal {
// Simple lock-based unbounded size queue (multi producer; multi consumer) based
// on "Simple, Fast, and Practical Non-Blocking and Blocking Concurrent Queue
// Algorithms" by M. Scott and M. Michael.
// See:
// https://www.cs.rochester.edu/research/synchronization/pseudocode/queues.html
template<typename Record>
class LockedQueue {
    public:
        inline LockedQueue();

        inline ~LockedQueue();

        inline void Enqueue(const Record& record);

        inline bool Dequeue(Record* record);

        //inline bool IsEmpty() const;

        //inline bool Peek(Record *record) const;

    private:
        struct Node;

        mutable base::Mutex head_mutex_;
        base::Mutex tail_mutex_;
        Node* head_;
        Node* tail_;

        DISALLOW_COPY_AND_ASSIGN(LockedQueue);
};

}  // namespace internal
}  // namespace v8

#endif  // V8_LOCKED_QUEUE_
